docs(09-02): complete weight breakdown visualization plan

- Create 09-02-SUMMARY.md with execution results
- Update STATE.md with completion status and decisions
- Mark CLAS-02, VIZZ-01, VIZZ-02, VIZZ-03 requirements complete

.planning/phases/09-weight-classification-and-visualization/09-02-SUMMARY.md

@@ -0,0 +1,107 @@
+---
+phase: 09-weight-classification-and-visualization
+plan: 02
+subsystem: ui
+tags: [react, recharts, donut-chart, tailwind, weight-visualization, pie-chart]
+
+# Dependency graph
+requires:
+  - phase: 09-weight-classification-and-visualization
+    provides: classification column on setupItems, getSetupWithItems returns classification field, SetupItemWithCategory type
+provides:
+  - WeightSummaryCard component with donut chart and classification subtotals
+  - Pill toggle for category/classification chart views
+  - Recharts integration (PieChart, Pie, Cell, Tooltip, Label, ResponsiveContainer)
+  - Custom tooltip with formatted weight and percentage display
+affects: []
+
+# Tech tracking
+tech-stack:
+  added: [recharts]
+  patterns: [donut chart with center label, pill toggle view switcher, chart data transformation from items array]
+
+key-files:
+  created:
+    - src/client/components/WeightSummaryCard.tsx
+  modified:
+    - src/client/routes/setups/$setupId.tsx
+    - package.json
+
+key-decisions:
+  - "Recharts v3 Cell component used for per-slice colors (still functional, deprecated for v4)"
+  - "Fixed numeric height on ResponsiveContainer (180px) to avoid zero-height rendering"
+  - "Zero-weight items filtered out before chart data to prevent invisible/NaN slices"
+
+patterns-established:
+  - "Donut chart: PieChart with Pie innerRadius/outerRadius and Label position=center for hole text"
+  - "Chart data transformation: group items by key, sum weights, compute percentages, filter zeroes"
+  - "Pill toggle view switcher: reusable pattern for switching between data breakdowns"
+
+requirements-completed: [CLAS-02, VIZZ-01, VIZZ-02, VIZZ-03]
+
+# Metrics
+duration: 2min
+completed: 2026-03-16
+---
+
+# Phase 9 Plan 2: Weight Breakdown Visualization Summary
+
+**Recharts donut chart with category/classification toggle, weight subtotals card, and hover tooltips inside setup detail page**
+
+## Performance
+
+- **Duration:** 2 min
+- **Started:** 2026-03-16T14:18:52Z
+- **Completed:** 2026-03-16T14:20:57Z
+- **Tasks:** 1 (+ 1 auto-approved checkpoint)
+- **Files modified:** 4
+
+## Accomplishments
+- Created WeightSummaryCard component with donut chart visualization using Recharts
+- Implemented pill toggle switching between category and classification chart views
+- Built weight subtotals display (Base | Worn | Consumable | Total) with colored indicator dots
+- Added custom tooltip showing segment name, formatted weight, and percentage on hover
+- Rendered total weight in center of donut hole using selected weight unit
+- Wired WeightSummaryCard into setup detail page below sticky bar (only when items exist)
+- Handled edge case of zero-weight items with placeholder message
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Install Recharts, create WeightSummaryCard, wire into setup detail page** - `d098277` (feat)
+
+## Files Created/Modified
+- `src/client/components/WeightSummaryCard.tsx` - New component with donut chart, pill toggle, subtotals, and custom tooltip
+- `src/client/routes/setups/$setupId.tsx` - Added WeightSummaryCard import and rendering inside itemCount > 0 block
+- `package.json` - Added recharts dependency
+- `bun.lock` - Updated lockfile with recharts and its dependencies
+
+## Decisions Made
+- Used Recharts v3 Cell component for per-slice colors (functional in v3, deprecated for v4 removal)
+- Fixed 180px height on ResponsiveContainer to prevent zero-height rendering issue
+- Filter zero-weight entries before passing to chart to avoid invisible/NaN segments
+- Default view mode is "category" (most useful initial view for gear analysis)
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+None
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Phase 9 complete: classification badges + weight visualization both functional
+- All 121 tests pass, build succeeds, lint clean on modified files
+- Recharts available for any future chart features
+
+## Self-Check: PASSED
+
+All 3 files verified present. Task commit (d098277) confirmed in git history. recharts found in package.json. WeightSummaryCard found in $setupId.tsx.
+
+---
+*Phase: 09-weight-classification-and-visualization*
+*Completed: 2026-03-16*